Add a testimonial.

index.html

@@ -416,6 +416,15 @@ <h1>Useful Links</h1>
 </p>
 </div>
 <div>
+<p>&raquo;Cython produces binaries much like C++, Go, and Rust do. Now with GitHub Actions the
+cross-platform build and release process can be automated for free for Open Source projects.
+This is an enormous opportunity to make the Python ecosystem 20-50% faster with a single
+pull request.&laquo;
+&rarr;
+<a href="https://grantjenks.com/docs/cython-for-all/">Grant Jenks</a>
+</p>
+</div>
+<div>
 <p>
 &raquo;I'm honestly never going back to writing C again. Cython gives
 me all the expressiveness of Python combined with all the performance